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platform/chrome: cros_ec_lightbar: Set PROBE_PREFER_ASYNCHRONOUS 

This driver takes on the order of 15ms to start on some systems. Even on
systems where there is no lightbar support, it can take a few
milliseconds just to probe the EC for support. It shouldn't have many
cross-device dependencies to race with, nor racy access to shared state
with other drivers, so this should be a relatively low risk change.

This driver was pinpointed as part of a survey of top slowest initcalls
(i.e., are built in, and probing synchronously) on a lab of ChromeOS
systems.

Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/20221101152132.v2.4.I565598102e0bfb03bdf8c090d3bfdf954d026bc5@changeid
This commit is contained in:
Brian Norris 2022-11-01 15:22:09 -07:00 committed by Tzung-Bi Shih
parent 692a68ad7f
commit 873ab3e886
1 changed files with 1 additions and 0 deletions
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1
drivers/platform/chrome/cros_ec_lightbar.c
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@ -602,6 +602,7 @@ static struct platform_driver cros_ec_lightbar_driver = {
.driver = {
.name = DRV_NAME,
.pm = &cros_ec_lightbar_pm_ops,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.probe = cros_ec_lightbar_probe,
.remove = cros_ec_lightbar_remove,